Infinite Haunted House

[Infinite flow + no golden finger + intelligent supporting characters and villains + compelling stories + sound logic] A mysterious witch, an eerie shrine: on his quest to find the truly bizarre, a strange-fiction writer is swept into a wondrous world of bloodstains. First bloodstain: A prince holds a bizarre blood-sacrifice ritual. As sacrifices, we are hunted by strange, intelligent hands with incredible strength. Meanwhile, one of us turns into a demon and must kill everyone. As an ordinary fiction writer, how can I get out of this alive? Second bloodstain: My companions and I enter a monster-filled version of Little Red Riding Hood's world. The living villagers have been replaced by unknown monsters, and even our companions fall victim to them. Little Red Riding Hood's grandmother is brutally eaten by the wolf uncle who used to be so kind. Luckily, a vampire saves Little Red Riding Hood from death. What is the truth behind it all? From the fourth bloodstain onward, I become a terrifying murderer, pitted against my former companions and newcomers in a locked-room mystery set in a snowbound mountain villa. Radioactive substances surround us, and protective suits are scarce. In this dreadful environment, I even lose my memory and believe I am a good person... But the deaths continue, and the evidence points to me. Who is the second killer hiding in the shadows?